Unbalanced hub design

Patent metadata

Field	Value
Publication number	US-9733469-B2
Application number	US-201514789324-A
Country	US
Kind code	B2
Filing date	Jul 1, 2015
Priority date	Jul 1, 2015
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

A color wheel, comprises a hub portion, configured to act as a rotor for coupling to a motor and having a disk-shaped surface; an optically active radial portion, attached to or integrated with the hub portion and configured to optically process incident light; and a balancing adaptation to the disk-shaped surface of the hub portion, comprising one or more of: (a) a recess in the disk-shaped surface extending to an edge of the disk-shaped surface; (b) an annular groove in the disk-shaped surface having a non-uniform width and/or being non-concentric with the disk-shaped surface; (c) an annular groove in the disk-shaped surface, at least a portion of which is filled by a balancing mass part; and (d) a groove and/or a matrix of recesses in the disk-shaped surface arranged to define a portion of an annulus in shape.

First claim

The invention claimed is:

1. A colour wheel, comprising:
a hub portion, configured to act as a rotor for coupling to a motor and having a disk-shaped surface;
an optically active radial portion, attached to or integrated with the hub portion and configured to optically process incident light; and
a balancing adaptation to the disk-shaped surface of the hub portion, comprising one or more of:
(a) a recess in the disk-shaped surface extending to an edge of the disk-shaped surface;
(b) an annular groove in the disk-shaped surface having a non-uniform width and/or being non-concentric with the disk-shaped surface;
(c) an annular groove in the disk-shaped surface, at least a portion of which is filled by a balancing mass part; and
(d) a groove and/or a matrix of recesses in the disk-shaped surface arranged to define a portion of an annulus in shape;
wherein the optically active radial portion has a non-uniform mass along its circumference due to a part of the optically active radial portion having a different density in comparison with the remainder of the optically active radial portion, and wherein at least part of the balancing adaptation is positioned on the hub portion adjacent or opposite to the part of the optically active radial portion with the different density.

2. The colour wheel of claim 1 , wherein the balancing adaptation further comprises one or both of:
(e) an annular groove in the disk-shaped surface; and
(f) a matrix of recesses in the disk-shaped surface arranged to define a full annulus in shape.

3. The colour wheel of claim 1 , wherein the (a) recess in the disk-shaped surface extending to the edge of the disk-shaped surface comprises a recess across a region of the disk-shaped surface bounded by a chord.

4. The colour wheel of claim 1 , wherein the (b) annular groove in the disk-shaped surface having a non-uniform width is at least partly defined by two non-concentric circles.

5. The colour wheel of claim 1 , wherein the (c) annular groove in the disk-shaped surface is at least 50% filled by the balancing mass part.

6. The colour wheel of claim 1 , wherein the (c) annular groove in the disk-shaped surface is no more than 90% filled by the balancing mass part.

7. The colour wheel of claim 1 , wherein the (d) groove and/or the matrix of recesses in the disk-shaped surface is partially filled with a balancing mass part.

8. The colour wheel of claim 1 , wherein the density of the balancing mass part is different than that of the hub portion.

9. The colour wheel of claim 1 , wherein the balancing mass part comprises a set adhesive material or a clip configured to fit a groove in the disk-shaped surface.

10. The colour wheel of claim 1 , wherein the balancing adaptation comprises two or more of (a), (b), (c) and (d).

11. The colour wheel of claim 1 , wherein one or more of:
the part of the optically active radial portion has a higher density in comparison with the remainder of the optically active radial portion and the balancing adaptation comprises a recess or groove positioned on the hub portion adjacent to the part of the optically active radial portion with the higher density;
the part of the optically active radial portion has a higher density in comparison with the remainder of the optically active radial portion and the balancing adaptation comprises a balancing mass part positioned on the hub portion opposite to the part of the optically active radial portion with the higher density;
the part of the optically active radial portion has a lower density in comparison with the remainder of the optically active radial portion and the balancing adaptation comprises a recess or groove positioned on the hub portion opposite to the part of the optically active radial portion with the higher density;
the part of the optically active radial portion has a lower density in comparison with the remainder of the optically active radial portion and the balancing adaptation comprises a balancing mass part positioned on the hub portion adjacent to the part of the optically active radial portion with the higher density.

12. The colour wheel of claim 1 , wherein one or more of:
the balancing adaptation comprises a balancing mass part positioned on the hub portion adjacent or opposite to the part of the optically active radial portion with the different density;
the balancing adaptation comprises (a) and the recess is positioned on the hub portion adjacent or opposite to the part of the optically active radial portion with the different density;
the balancing adaptation comprises (b) and a widest part of the annular groove is positioned on the hub portion adjacent or opposite to the part of the optically active radial portion with the different density; and
the balancing adaptation comprises (d) and the groove and/or matrix of recesses are positioned on the hub portion adjacent or opposite to the part of the optically active radial portion with the different density.

13. The colour wheel of claim 1 , wherein the optically active radial portion comprises a diffuser segment.

14. The colour wheel of claim 13 , wherein the diffuser segment comprises soda lime glass and/or borosilicate glass.

15. The colour wheel of claim 1 , further comprising one or both of:
a light management portion; and
a light modulation portion.

16. A method for manufacturing a colour wheel, comprising:
attaching or integrating a hub portion and an optically active radial portion, the hub portion for acting as a rotor to be coupled to a motor and having a disk-shaped surface and the optically active radial portion for optically processing incident light so as to provide an optical effect when the colour wheel is rotated, wherein the optically active radial portion has a non-uniform mass along its circumference due to a part of the optically active radial portion having a different density in comparison with the remainder of the optically active radial portion;
providing a balancing adaptation to the disk-shaped surface of the hub portion, comprising one or more of:
(a) a recess in the disk-shaped surface extending to an edge of the disk-shaped surface;
(b) an annular groove in the disk-shaped surface having a non-uniform width and/or being non-concentric with the disk-shaped surface;
(c) an annular groove in the disk-shaped surface, at least a portion of which is filled by a balancing mass part; and
(d) a groove and/or a matrix of recesses in the disk-shaped surface arranged to define a portion of an annulus in shape; and
positioning at least part of the balancing adaptation on the hub portion adjacent or opposite to the part of the optically active radial portion with the different density.

17. The method of claim 16 , wherein the step of providing a balancing adaptation further comprises:
effecting the balancing adaptation in the disk-shaped surface of the hub portion in an initial configuration;
determining an imbalance to the colour wheel in the initial configuration; and
adjusting the configuration of the balancing adaptation to compensate for the imbalance.

18. The method of claim 17 , wherein the step of determining an imbalance to the colour wheel comprises measuring the imbalance during rotation of the colour wheel.

19. The method of claim 17 , wherein the step of adjusting the configuration of the balancing adaptation to compensate for the imbalance comprises one or more of: adding a balancing mass part to the disk-shaped surface; configuring a balancing mass part; where the balancing adaptation comprises one or more rece

Assignees

• Materion Corp

Inventors

• Liu Xin
• Xu Irene
• Cao Simon

Classifications

• G03B21/008

  using micromirror devices · CPC title

• G02B26/008 Primary

  in the form of devices for effecting sequential colour changes, e.g. colour wheels · CPC title

• G02B26/00

  Optical devices or arrangements for the control of light using movable or deformable optical elements (control of light by modification of the optical properties of the media of the elements involved therein G02F1/00) · CPC title

• G01M1/32

  by adding material to the body to be tested, e.g. by correcting-weights · CPC title

• H04N9/3114

  by using a sequential colour filter producing one colour at a time · CPC title